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Old 04-05-2011, 01:53 AM   #1
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Default Gmax 3900 & 7900

I just bought a gmax 3900 & 7900 off a retiring painter. I hear I can run four guns off the huge 7900(not that I would ever need to). I was hoping I could atleast run two guns off the 3900 with 515 tips. Anybody have a 3900 or familiar with it?What have you done?
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Old 04-05-2011, 08:47 AM   #2
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You should be able to run 2 guns no problem off either pump. I dont think I would try 4....that might be a bit much.

If they were mine, and I wanted multi gun setups, Id get a ball valve installed where the second line goes. That way if you only need the one line, you can easily shut off the second line and remove the hose. No need to carry around the extra weight
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Old 04-05-2011, 08:19 PM   #3
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Both will handle 2 guns. Get the shutoff valve at SW. Make sure you have the same lengths on each machine and use the same tip in both otherwise they will fight each other and lower pressure in one gun. Also the first hose should be a 3/8 then go down to 1/2 better for flow
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Old 04-05-2011, 10:26 PM   #4
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Want to sell them?
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